1 86 



Journal of Agricultural Research 



Vol. XVI, No. 7 



After the young oat plants had reached a height of about lo inches 

 they were thinned to the same number of plants in each pot and as near 

 equal in size as possible. The oats were brought to maturity and har- 

 vested and, after thoroughly air-drying, the grain was threshed and the 

 weights of the air-dry grain and straw produced in each pot were deter- 

 mined. There were two control pots in this experiment, and the average 

 weight of the grain and the straw from these two pots was taken as a 

 check against other pots receiving compounds of barium or strontium in 

 this series. 



Table II. — Effect of certain barium and strontium compounds upon the growth of oats — 



Second series 



Pot No. and treatment. 



Control pot i 



Control pot 2 



Average 



Pot 3-I-2 gm. of barium carbonate 



Pot 4-1-5 gm. of barium carbonate 



Pot 5-I-2 gm. of strontium carbonate. .. 

 Pot 6-i-S gm. of strontium carbonate. .. 

 Pot 7-I-2 gm. of barium carbonate and 



2 gm . of strontium carbonate 



Pot 8-f-5 gm, of barium sulphate 



Weight of 

 grain. 



Gm. 

 19-25 

 17.40 



18. ?,Z 

 18.50 



20. 65 

 18. 40 



21. 10 



16. 50 

 II. 00 



Gain or loss 



in weight of 



grain over 



control. 



Gin. 



Weight of 

 straw. 



-l-o. 17 



+ 2.32 

 -f .07 



+ 2.77 



-1.83 



-7-33 



Gm. 

 39-25 

 34-50 



36.88 

 40. 00 

 44-75 

 37-15 

 46.25 



37-25 

 24-75 



Gain or loss 



in weight of 



straw over 



control. 



+ 3- " 

 + 7-87 

 + .27 



+ 9-37 



+ -37 

 -12. 13 



Table III. — Comparison of weight and percentage of nitrogen, phosphorus, and potas- 

 sium per pot — Second series 



Pot No. and treatment. 



Control 



Pot3-|-2gm. of barium carbo- 

 nate 



Pot 4-I-5 gm, of barium carbo- 

 nate 



Pot 5-f 2 gm of strontium car- 

 bonate 



Pot6-|-5gm. of strontium car- 

 bonate 



Pot 7-H2 gm. of barium carbo- 

 nate -|-2 gra. of strontium car- 

 bonate 



Pot 8-f-5 gm. of barium sul- 

 phate 



Nitrogen. 



Gm. 

 0.3217 



.3608 



. 4120 



•3367 



•4579 



-2739 



- 1727 



Per cent. 



I- 755 

 1-95 

 2. 00 



1.83 

 2. 17 



1.66 



1-57 



phosphorus. 



Gm.. 

 o. 0752 



0777 

 0847 



0773 

 0886 



0644 

 0418 



Per cent. 

 O. 41 



-42 



.41 



.42 



-42 



-39 



Gm. 

 o. 0522 



.0518 

 •0599 

 •0534 

 .0570 



. 0429 

 .0286 



Per cent. 

 .285 



.28 



.29 



.29 



.27 



.26 

 .26 



In Table II is given the amount of barium or strontium compounds 

 added to each pot, and the air-dry weights of the grain and the straw 

 produced in each of the experiments. Table III gives a partial analysis 



